Question

what are the compounds of land and why it is red in colour answer the following questions​

Answer 1

When nitrogen and sulphur both are present in the organic compound, they combine during fusion to form sodium thiocyanate (sulphocyanide), This when heated with FeSO 4 or FeCl 3, produces a red blood colouration due to ferric thiocyanate (or sulphocyanide). Thus, thiourea, and p-aminobenzene sulphonic acid give red colour on Lassaigne test.